PITA! :gaah3406 exhaust studs break all the time.
John can you elaberate a little on the dowels. ThanksIf you expect to work on any of the cats you will become a expert at drilling straight threw the exhaust studs, It is easy with a standard drill, and bit, when you have to use an angle drill and shortened bits that is when you really separate, the prows. Learning how to sharpen a drill bit properly for different metals.
Removing one that is shattered a half inch inside the head gets interesting.
I have a set of alignment dowels that really cut back on the amount of studs that break.
First off, leave drilling as a LAST resort. Take a wire brush on a drill and clean all around the stud. Take some 3/8 flat washers and start welding (mig welder) them to the stud. Even if it is countersunk in the hole, let the wire hit the stud and work its way out to the washer. Let it cool a few moments, then weld another to it, then another. Lightly tap the top, with a hammer pushing in on the stud. Use channel locks and start twisting either way.How many of you guys have needed 3406 exhaust manifold studs drilled out/replaced? Did your exhaust leak at the manifold?